> Calcium is supposedly alkaline More precisely, calcium is an alkali earth metal (second column from the left in the periodic table), and those metals are so

> Calcium is supposedly alkaline More precisely, calcium is an alkali earth metal (second column from the left in the periodic table), and those metals are so named because the compounds in which they were first discovered were alkalis. But that does not mean all calcium compounds are alkalis. For example, calcium citrate, which is a common way to convey calcium in supplements, can be weakly acidic in water solution (because of the citrate ion).